I bought my MacBook Pro new in May 2016, and I’m starting to run into battery troubles. For example, this morning, I did a little less than two hours of web browsing, Tweetbot, and word processing before my batter was at >10%. Is this an issue where I’m going to have to get a new computer or replace the batter, or is there a simpler answer that I’m missing?

You can visit your favorite Apple store (please book a Genius Bar appointment first) and they can run Diagnostics to determine the health of your battery. Replacement cost for a battery runs $199US. If there isn’t an Apple store nearby, you could call AppleCare and they should be able to run the same test.